Dynamic magnetic information storage or retrieval – Converting an analog signal to digital form for recording;...
Patent
1997-01-13
1998-10-06
Sniezek, Andrew L.
Dynamic magnetic information storage or retrieval
Converting an analog signal to digital form for recording;...
375261, G11B 509
Patent
active
058186530
ABSTRACT:
A digital signal magnetic recording and reproducing apparatus includes an encoding portion for convolutionally coding an input digital data, a modulating portion for quadrature-amplitude-modulating and phase-shift-keying-modulating the convolutionally coded digital data, a pilot signal mixer for generating a pilot signal and adding it to the modulated signal, and a recording controller for forming a magnetized signal suitable for a magnetic recording medium from the modulated signal mixed with the pilot signal. The apparatus also includes a reproducing controller for outputting a digital signal, in which distortion and deterioration produced during transmission are corrected, from the magnetized signal reproduced in the magnetic recording medium, a carrier wave restoring portion for generating a clock signal at the carrier signal frequency in response to a pilot signal in the reproduced magnetized signal, a demodulating portion for demodulating the quadrature-amplitude-modulated signal output from the reproducing controller and a decoding portion for outputting original digital data by Viterbi-decoding convolutionally coded data from the demodulating portion. The apparatus increases frequency utilization efficiency by adopting a multiple valued digital modulation method, which is effective in recording in a high density signal. The apparatus is characterized in that the overall signal processing is processed digitally.
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Chang Yong-deok
Park Sam-yong
Samsung Electronics Co,. Ltd.
Sniezek Andrew L.
Wamsley Patrick
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